electric bulb is rated 220 V and 5 W. a)
Calculate the current required. b) Calculate
the resistance of its heating element. c)
When it is operated on 110 V, what will be the
power consumed? Please answer
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(a)
Given :-
- v = 220V
- p = 5 W
- I = ?
we know that,
- P = V x I
so,
- I = P/V
- I = 5/220
- :=>I = 0.02 A
(b)
- V = I x R (ohm's law)
So,
- R = V/I
- R = 200/0.02
- R = 2000/0.2
- R = 20000/2
- R = 10000 Ω
(c)
Given :-
- V = 110 V
- I = 0.02
- P = ?
we know that,
- P = V x I
- P = 110 x 0.02
- :=>P = 2.2 W
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